Del Potro, Murray, Berdych reach QFs; three seeds ousted in Rotterdam

Rotterdam, The Netherlands (SportsNetwork.com) - Top seed and reigning champion Juan Martin del Potro, former titlist Andy Murray and third seed Tomas Berdych were among Thursday's second-round winners, while a trio of seeds went by way of upsets at the $1.85 million ABN AMRO World Tennis Tournament.